Grinimng machine



June.-l 7, 1949. M. l. MATHEwspN 2,472,222

' GRINDING MAcHI'N-E v vFiled April 9, 1948 s sheets-sheet 1 June 7, 1949 M. MATHEwsoN 2,472,222

GRINDENG MACHINE Filed April 9, 1948 3 Sh9 ets'-Sheet Z June 7, 1949. M. MATHEwsoN u 2,472,222

GRINDING MACHINE Filed April 9.,1948 :s sheets-sheet 5 Patented `une 7, 1949 'GRNDING MACHINE Maxwell I. Mathewson, Providence, R. I., assignor to Brown and Shar-pe Manufacturing Company, a corporation ofRhode Island Application April9, 1948, Serial No. 19,939

The present invention yrelates to improvements in grind-ing machines. The invention Eis -concerned 'lmore specifically with :a inovel land improved arrangement f'of fa `rvertically adjustable support lor the cylindrical post andfsleeve 4type for ythe-grinding head fof 1a grinding machine.

It is a principal object-ofthe 'inventionto provide 1a novel and r'improved gibbing ydevice v:'for maintaining a lcl'ose sliding yengagement of ezthe relatively shiftable sleeve yand post 'elements tof the grinding fhead support which =has iembodied therein adjustable means vfor controlling thesan-gular relation of the'post and sleeve elements for eifecti'ng 'a '-iine adjustment fof the -angular positionf of f the grinding wheel r aboutithe vertical @post axis andtran'sversely 1yvith'rela'tion to the 'rotative axis 1 ofthe work.

wAs fhereinafter more ifully :set ;forth, ISrgibbing elements .are provided on vthe sleeve element 1 for engagement with followersurfaces:onithepostextending 'longitudinally thereof `and .disposed to take th'ethrust ofth'esgibbin'g :elements at-fopposite `sides of the post axis, fthelrrelationiof 'the gibs and :follower surfaces zreierredfto `tbeing: such as to maintain 'xa close'fslidingtt also-*between the `Iengaged i cylindrical `bearing surfaces lnf .the post and sleeve. In accordancewiththernvention, means of adjustment are-.providediforadjusting the relative ipositionsfof l-thelgibsf on vthe sleeve, and thereby the'relativei'angular.positions of the cooperating;post` and sleeve elements of :the supportA In the illustrated form "of theinven tion shown, an extremely lne y:adjustrn'enttoi i the relative position of the gibs -sieiectedbyrmeans of adjusting screws Whichfarela-rranged to :engage against'and to control -the positionner :the gibs on the sleeve element.

Two separate forms 'of the invention arehere shown and described. In' one formthe'y invention is embodied in a grinding machine ofthe general typ-e having va stationary sleeve .support .iandffa vertically adjustable cylindrical post lonwl'iiclrthe grinding wheel SuppOrt'iSicarried. `For/controlling vthe angular position 'of .-thegrindingkwl-reel about the ,verticali axis or.' the supportingy post` and withrelation tothe rotational-Laxislf'the Work, the .postv is fgroovedy to provide -aipairlof planeisur- -faces' extending longitudinallyof the postatoppositesides oflthe post axisv and lyingssubstantially!y in a single plane. 'The relatively stationary sleevesupport has mounted thereina pair fgibs which are arranged for engage-mentwiththeplane guiding surface referred to, and a'djustingscrews which y#are -larrange'd to l engage against the Jgibs and to providefmeansfor adjuistingthe-gibs rela- (Cl. .5l-166) tively `to one another on the sleeve support. Tllfhe post is supported on one .-side against :the :gibs and at its `other side againstthe `bearing Asurface provided .bythe sleeve.

.-In an alternative form the invention.isillLlS-l trated as embodied in a grinding machine ofthe general Atype Awhich is provided with a cylindrical supporting postfixed against `vertical adjustment in'relation to the based-f the'machinefandrhavng mounted thereon va `vertically adjustable sleeve Supportfor the grinding wheelhead. In this embodiment vof the ;invention, the "illustrated ,xmachine'ispprovided with a grinding-wheel;hea'.d .vertical adjusting screw which is arrangedtoiextend downwardly along the "axis `of fthe -postgand .ls supported against axial movement with relation to .the post by means of .a bearing at its upper end. .A cooperating'liftingvnuttakes'the form of a yoke, the arms of which extend i'through slots 1in the post, and are at .theirouterends fsecured tothe cooperating vertically adjustable sleeve supporting velement for the grinding Wheel. Inlthis form `of the invention, 1thearms 1of;the lifting nut or yoke are-employedasgibs which are yadapted for forward f and back vadjustment over .la small range with "relation to the sleeve member to which `they v`are attached. 4Adjustmentiis effected by means of a pair of adjusting screws screw-threaded into the vsleeve member for engagement against opposite ends o'f'ithezyoke arms of the lifting nut. The `screws liare:adjusted *to-cause the arms of the yoke, acting as gibs, to bearagainst one side ofthefslot' in the-vertical post through which the ,yoke arms pIQJ'ect. Thrust of the gibbinggzdevices I-in'the 'zopposite direction is'taken bythe internal bearing,surface offithe sleeve and the yexternal bearing surfaces4 of the stationarypost engaging therewith. .Adjustment of the adjusting screws serves to control within `very close limits the Aangular .adjusted position of the. sleeve support iwith ,relation .to the yokeuand associated post.

rWith the above noted and other oblectszin view as may Ahereinafter appear, the-severalv `features ofi the invention consist walso in the :devioes,:.com binations and arrangements or parts `hereinafter described and claimed, which togethergwithzthe advantages to be obtained therebywill be-readily understood by one skilled inthe art fromfthe following description taken in connection-.withfthe accompanying drawings, in which Figlffisfasview in left side elevation illustrating: one1embodiment ofi-the invention in a "grinding machine,f, portions oflthe machine having 'beenfrbroken aawayfand certain underlying parts; being shownv in section,

only so much of the machine being shown as is believed necessary to indicate the connection of the invention therewith; Fig. 2 is a sectional plan view taken on the line 2-2 of Fig. 1, illustrating particularly the gibbing arrangement between the vertically adjustable post and fixed sleeve elements of the grinding head support; Fig. 3 is a sectional plan view taken on the line 3 3 of Fig. i; Fig. 4 is a somewhat fragmentary view in right side elevation illustrating an alternative embodiment of the invention in a grinding machin-e, only so much of the machine having been shown as is believed necessary to illustrate the connection of the invention therewith; Fig. 5 is enlarged sectional view in front elevation taken on the line 5-5 of Fig. 4, and illustrating particularly the fixed post and vertically adjustable sleeve elements of the grinding head support; and Fig. 6 is a sectional plan View taken on the line 6-'3 of Fig. 5.

Referring specifically to Figs. 1, 2 and 3 of the drawings, the invention is disclosed as embodied in a grinding machine comprising generally a base member I0, a work supporting assembly including a table I2 adapted for translatory movement, and providing support for the usual headstock and tailstock assembly indcated at I4. The grinding wheel supporting assembly of the machine consists of a grinding head I6 rigidly secured to the upper end of a vertically disposed and vertically adjustable hollow cylindrical post or column I8. The grinding head provides support for a horizontally disposed grinding wheel spindle 20 and grinding Wheel 22. Power to drive the grinding wheel is provided from a drive shaft on the base through a system of belts and pulleys including a belt 24 extending upwardly within the column and adapted to ride on a pulley 26 mounted on the spindle 20.

The grinding wheel head supporting column I8 is supported for vertical adjustment within a sleeve support 30 carried in the base, such adjustment being effected by means of a vertically disposed adjusting screw 32 supported at its upper end in a bearing in the grinding head, and adjacent its lower end screw-threaded into a cooperating nut element 33 which is in turn supported in an extension 34 formed integrally with and extending rearwardly from the sleeve support 30.

In accordance with the invention, a novel gibbing arrangement is provided for the relatively movable cylindrical post and sleeve elements of the grinding wheel supporting assembly, and including provision for a forward and back adjustl ment of the gibbing elements through a limited range in a plane normal to the post axis to enable the grinding wheel to be accurately positioned angularly with relation to the work. As shown in Figs. 2 and 3, the post I8 is formed with two vertically extending grooves providing a pair of bearing surfaces 48, 42 which are disposed in a single plane at opposite sides of the post axis. The internal surface of the sleeve support 30 is correspondingly notched at 44, 46 to provide rectangular apertures within which are received a. pair of gibs 48, 50 adapted for engagement respectively against the bearing surfaces 40 and 42. Each gib is supported against axial movement with respect to the sleeve support 30, and is adapted to be moved adjustably against its bearing surface on the post I8 by means of a pair of locating pins 5I flxedly mounted in holes in the sleeve element 3U with the inner ends thereof fitted loosely into recesses 52 in the respective gibs 48, 50. Each gib is arranged to be acted upon by an adjusting screw 53 screw-threaded into the sleeve support 38 and arranged at its inner end to bear against a central surface portion of the gib. As shown in the figures, two locating pins 5I and one adjusting screw 53 are provided for the support of each gib. Locking screws 56 screw-threaded into the sleeve support are adapted for locking engagement against the sides of the respective adjusting screws 53. As best shown in Figs. 2 and 3 of the drawings, the internal bearing surface of the sleeve support 30 is recessed longitudinally to form a shallow depression or groove 60 in the bearing surface of the sleeve. With this construction and arrangement of the parts, the cylindrical post or column I8 is supported at one side by means of the two gibs 48, 50 bearing against surfaces 40, 42, and at its other side by the bearing surface portions of the sleeve support 38 located at each side of the cutaway area 60. An extremely close angular adjustment in the position of the supporting post and grinding head with relation to the base and work supporting elements of the machine is readily effected by adjustment of the adjusting screws 53 to move the gibs 48, 50 forward or back with respect to one another.

As best shown in Figs. 1 and 3 of the drawings, an additional gib is provided for further supporting the post I8 with relation to the sleeve 30 at a point adjacent the .lower end of the sleeve. The gibbing arrangement referred to, consists of a gib 63 carried in a vertically arranged recess 64 in the sleeve member. 30 for engagement with a portion of the external periphery of the post I8 at the same side with and between the two plane bearing surfaces 40, 42 above described. The gib 63 is held in position by means of two locating pins 6I mounted in holes in the sleeve member and adapted to project loosely into recesses 65 formed adjacent the upper and lower ends of the gib 63. An adjusting screw 66 screw-threaded through the casing 381 is provided which engages against a centrally located surface portion of the gib. The adjusting screw 66 is locked 'in its adjusted position by means of a small tranversely extending locking screw 69.

The grinding machine illustrated in Figs. 4, 5 and 6, as embodying the severa1 features of the invention in an alternative form, comprises generally a base member 'I0 on which is mounted a work supporting assembly including a table I2 adapted for translatory movement and providing support for a headstock and tailstock assembly 'I4 of ordinary description. 'I'he machine is also provided with a grinding wheel assembly comprising a grinding head 'I6 on which is mounted a grinding wheel 18, a grinding wheel spindle and an electric driving motor 82 for the spindle. In the machine illustrated in Figs. 4, 5 and 6, the grinding head I6 is formed integrally with a supporting sleeve 84 adapted for vertical adjustment on a relatively fixed hollow post or co1- umn 86. Vertical adjustment of the spindle head is obtained by means of a vertical adjustment screw 88 which extends downwardly within the column or post along its axis, and is rotatably supported at its upper end in a bearing 9U in the upper end of the stationary post 86. Toward its lower end the adjusting screw is in threaded engagement with a lifting nut 92 which takes the form of a yoke with laterally extending arms 94, 96 which project outwardly through vertical slots 98, |00 in the post 86. At their outer ends the yoke arms 94, 96 are adjustably screwed to the supporting sleeve 84 by means of machine screws |02 which extend downwardly through oversize holes |04 in the yoke arms into threaded screwreceiving holes in the sleeve support.

In the form of the invention illustrated in Figs. 4, 5 and 6, the yoke arms 94, 96 are adapted and arranged to function as gibbing elements which engage against plane bearing surfaces at opposite sides of the post axis, and which are further arranged for forward and back adjustment relatively to the supporting sleeve in a plane normal to the post axis to provide for a limited relative angular adjustment of these parts for adjusting the position of the grinding wheel angularly with respect to the base and table elements of the machine. For adjustment of the position of the yoke arms 94, 96 with relation to the supporting sleeve 84, laterally extending adjusting screws H1B, |08 are threaded into the supporting sleeve 8 4 to. bear laterally against the yoke arms 94, 96 respectively. The adjusting screws are held rigidly in adjusted position by means of locking screws lill. With this construction and arrangement of the elements of the grinding wheel support, it will be evident that the yoke arms 94, 96 are brought to bear against the opposing walls H2, H4 respectively of slots 98, |00, and that the thrust in the opposite direction is taken up by the engagement of the cylindrical post with the internal bearing surfaces of the supporting sleeve 84. As indicated in Fig. 6, a shallow depression or groove I I6 is formed in the internal surface of the supporting sleeve 84 so that the post is engaged against only the separated portions of the internal surface remaining at each side of the groove H6. As best shown in Fig. 4, an additional gibbing device including an adjusting and clamping screw l I8 is provided adjacent the lower end of the supporting sleeve 84 for engagement with the peripheral surface of the post to further support the sleeve with relation to the post 8B. The screw H8 when it is brought into proper adjustment allows for a good sliding t, while in a tightened position it serves the added function of clamping the wheel slide.

It will be understood that the invention is not limited to the specific embodiments shown, and that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is:

1. In a grinding machine having a base, a work support and a grinding head, a vertically adjustable supporting assembly for the grinding head, which comprises cooperating vertically disposed cylindrical post and sleeve elements relatively shiftable for vertically adjusting the position of the grinding head, one of said post and sleeve elements being formed with guide surfaces disposed at opposite sides of and extending longitudinally of the cylindrical axis, and a gibbing device comprising gibbing elements supported from the other of said post and sleeve elements for engagement against said guide surfaces, and adjusting screws on said supporting element for adjusting said gibbing elements transversely of the supporting element against said gui-de surfaces.

2. In a grinding machine having a base, a work support and a grinding head, a vertically adjustable supporting assembly for the grinding head comprising cooperating vertically disposed cylindrical post and sleeve elements relatively shiftable for vertically adjusting the position of the grinding head, one of said post and sleeve elements `being formed with follower surfaces disH posed at opposite sides of and extending longitudinally of the post axis, a. gibbing device which comprises a pair of gibbing elements supported from the other of said post and sleeve elementsarranged to act transversely of the post axis and at each side thereof against said follower surfaces, and adjusting means acting on said gibbing elements for adjusting the positions of said gibbing elements individually against the cooperating follower surfaces.

3, In a grinding machine having a base, a work support and a grinding head, a vertically adjusta-Y ble supporting assembly for the grinding head comprising cooperating vertically disposed cy'- lindrical post and sleeve elements relatively shiftable for vertically adjusting the position of the grinding head, one of said post and sleeve elements being formed with follower surfaces disposed in a single plane at opposite sides of and extending longitudinally of the post axis, and a gibbing device which comprises a pair of gibbing elements adjustably supported from the other of said post and sleeve elements to act transversely of and -tangentially with respect to the post axis at each side thereof against said follower surfaces, and adjusting screws for adjusting the position of said gibbing elements individually transversely of the supporting element against the cooperating follower surfaces.

4. In a grinding machine having a base, a work support and a grinding head, a vertically adjustable supporting assembly for lthe grinding head comprising cooperating vertically disposed cylindrical post and sleeve elements relatively shiftable for vertically adjusting the position of the grinding head, said post element being formed with follower surfaces disposed at opposite sides of and extending longitudinally of the post axis, a gibbing device which comprises a pair of gibbing elements adjustably supported from the sleeve to act transversely of the post axis and to each side thereof against the follower surfaces, and adjusting means for adjusting the position of said gibs from the sleeve against said surfaces.

5. In a grinding machine having a base, a work support and a grinding head, a vertically adjustable supporting assembly for the grinding head comprising a vertically adjustable grinding head cylindrical post having formed in the periphery thereof recessed follower surfaces extending longitudinally of the post axis at opposite sides thereof, a relatively fixed cooperating sleeve having formed therein cooperating gib receiving recesses, an adjusting screw and nut for effecting the vertical adjustment of the post with relation to the sleeve, and a gibbing device comprising a pair of gib blocks carried in said sleeve recesses for engagement with said cooperating follower surfaces, and adjusting means for the gibs comprising adjusting screws for adjustably positioning the gibs individually from the sleeve against said cooperating surfaces.

6. In a grinding machine having a base, a work support, and a grinding head, a vertically adjustable supporting assembly for the grinding head, comprising vertically disposed cylindrical post and sleeve elements relatively shiftable for vertically adjusting the position of the grinding head, said post element being formed with a gib engaging surfa-ce lying in a plane parallel to the post axis to provide portions of said surface disposed to receive a gibbing thrust directed tangentially to opposite sides of the post axis, a gibbing device comprising a gibbing member having portions thereof arranged for engagement respectively against said portions of the gib engaging surface, means for supporting said gibbing member from the sleeve arranged to permit a transverse adjustment of the gibbing member relative to the sleeve, and adjusting screws operable to eect transverse and rotational adjustment of the gibbing member relative to the sleeve.

'7. In a grinding machine lhaving a base, a work support and a grinding head, a vertically adjustable supporting assembly for the grinding head comprising a vertically disposed cylindrical post element having a longitudinally extending slot passing through the walls of the post, and a sleeve element, said post and sleeve elements being relatively shiftable for vertically adjusting the position of the grinding head, means for effecting said relative longitudinal adjustment including an adjusting screw extending axially Within the post and supported for rotational movement and against axial movement with relation to the post, and a yoke threaded to receive the screw and having the arms thereof passing through said slots and secured at their outer ends to the sleeve, said yoke arms acting as gibs in cooperation with follower surfaces extending longitudinally of the post provided by one side of said slot, and adjusting means for positioning said yoke arms transversely to the sleeve against the respective :follower surfaces provided by one side of the slot in the post.

8. In a grinding machine having a base, a work support and agrinding head, a vertically adjustable supporting assembly for the grinding head comprising a vertically disposed hollow cylindrical post having a longitudinally extending slot passing through the walls of the post, and a vertically adjustable grinding head supporting sleeve carried by the post, an adjusting screw extending axially within the post and supported for rotational movement and against axial movement with relation to the post, a cooperating nut comprising a yoke threaded to the screw and having the arms thereof extending through the slot, said.

yoke arms acting as gibs in cooperating with follower surfaces provided by one side of said slot in the post, means for securing the yoke arms to the sleeve arranged to permit a transverse adjustment of the yoke relative to the sleeve, and adjusting screws for shifting said yoke arms transversely of the sleeve against the respective follower surfaces provided 'by one side of the slot in the post.

MAXWELL I. MATHEWSON.

No references cited. 

